KESS V2 is a ECU programming tool that is perfect for OBD use, while KTag is perfect for Jtag, BDM and all the Boot application (tricore and ST10).

With KESS V2 you programming directly through the OBD port of the vehicle, while with Ktag you need to take apart the ECU and open it, after you can make theread/write operation.

Many ECU has the advantage that can be read and write from OBD port (so KESS V2 is perfect), but there are lot ECU that need to disassemble from the car and open and this is the case for all the ECU that need to be programmed with Jtag, BDM and Boot protocols, so KTAG is needed.

So, withKtag v7.020 + Kess V2 v5.017, you can read and write ECU without token limitation forOBD,Jtag, BDM and Boot use for the new models and protocols.But it cannot be used forTricore; you need go toMPPS V21 cables.